But what’s really revealing is to hear what shopworkers see of the loneliness of their customers.

Image caption Edward has become friends with customers and attended their funerals

There are about 20 Sainsbury’s cafes piloting the “talking tables” idea, including the branch in Fulham, west London.

Edward Collet, who works on the welcome desk, every day sees people who come to the supermarket for company as much as for shopping.

He says some are the bereaved husbands who relied on the social networking skills of their wives and are now trapped in “solitary lives”.

‘Stigmatised’

They don’t want to be “stigmatised” as lonely, he says, and might crave company but not be able to ask for it.

Edward says they come up to the information desk for a chat about shopping – or even call up the helpline.

Image caption The tables for chatting are being introduced in 20 shops this autumn

He sees shoppers who will wait until they can be served by a particular check-out assistant because they see them as a friend with whom they can swap a few words.

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It’s their chance for some human interaction.

There are also young mothers, cut off from the adult company of work, who, Edward says, can seem quite angry, which he puts down to their feelings of isolation.

With so many public places closing, whether it’s post offices, libraries, churches or pubs, he says, the supermarket has become one of the last places people can still meet and feel safe.

He sees those at risk of chronic isolation – where people lose contact with the outside world and “basically die inside their houses”.

And there are others who have begun to show signs of dementia.

Talking, not laptopping

Edward has become so much a part of the life of the people using the shop that, he says, he has been to some of his customers’ funerals.

And, he says, staff in the shop often work alongside local charities, churches and food banks, in a kind informal support network.

Image caption Rupa Graham says young people and old people should spend more time together

Leigh Brown, the store manager, says much of what really happens in a shop goes unrecognised by the customers who dive in and out.

He says last week an elderly man was noticed spending the entire day in the shop – and as it was eventually closing, Leigh gave him a lift home.

The manager is confident the talking tables will catch on with customers, because, he says, he’s seen how in other places they attract their own “cult following”, with people making it part of their social lives.

Fear of strangers

The cafes also have their own secret tactic against being taken over by laptop users – none of them have power sockets.

So if these people working for a supermarket were asked for their own first-hand answers for tackling loneliness, what would they suggest?

Image caption The supermarket has become the modern equivalent of the village green

Rupa Graham says the challenge is to “bridge the gap” between generations in families – so that young people could spend more time with old people.

She also would like to have less negative news, because it creates a “perceived fear of talking to strangers” so that people are afraid to make friends.

Leigh says the most pressing problem is that “town centres are dying” – and the places where people might socialise are disappearing.

“What are we going to do with them? We need to re-invent town centres. We’re going to end up with ghost towns,” he says.

Protecting bus routes

Edward says that loneliness needs to be understood from the perspective of those most vulnerable.

Protecting public transport, particularly bus routes, is essential, he says.

Image caption Leigh Brown says that people don’t realise how much people rely on shops for company

“They might want to close a bus stop and say it’s only five minutes walk – but it’s not five minutes if you’ve got arthritis,” he says.

The other big question, linked to good transport, is a sense of safety. He says many elderly customers are worried about going out and they need to be able to travel safely and feel they are in a secure environment.

But, he says, all of this depends on a sense of community surviving – which itself can be a fragile thing.

In this part of London, he says, there has been rapid gentrification but there are still the links of older communities.

“There are people who bought a house for five bob in 1945 and their families are still here,” he says.

But will the tables get people talking?

On a rainy Monday morning, with the new signs in place, there were no takers. The conversation about loneliness is still waiting to begin.